unit heaters/ duct furnaces - … · lf24 unit heater performance specifications ld24 duct furnace...

TU, LF and LD Models

UNIT HEATERS/DUCT FURNACESTrue performance and rugged durability

Designed to last longer and perform betterSEPARATED COMBUSTION UNIT

HEATERS AT A GLANCE:

- Ideal for hard-to-heat applications requiring fresh air for combustion

due to excessive dust, dirt or humidity or negative pressure

- Easy access to components through a hinged door

- Heat capacity ranging from 40,000–300,000 Btuh

UNIT HEATERS AT A GLANCE:

- Meet a wide range of residential and commercial heating applications


DUCT FURNACES AT A GLANCE:

- Specially designed for applications that require duct systems


EFFICIENCY RATINGUnit Heaters

up to 82% thermal efficiency

Duct Furnaces 80% thermal efficiency

WARRANTIESUnit Heaters

15-Year Limited Warranty on stainless steel heat exchanger

10-Year Limited Warranty on aluminized heat exchanger

1-Year Limited Warranty on covered components

Duct Furnaces

5-Year Limited Warranty on stainless steel heat exchanger

2-Year Limited Warranty on aluminized heat exchanger

1-Year Limited Warranty on covered components

See warranty certificate for actual details.

Improve comfort and efficiency with Lennox’ heaters and furnaces

Lennox® heating products include durable unit heaters and duct furnaces designed

to operate at peak performance year after year. This reliability is the result of

advanced engineering and high-quality components.

One standard feature of all Lennox® unit heaters and duct furnaces is the tubular heat exchanger, designed to enhance performance and reliability. The exchanger’s curved design provides excellent heat transfer by completely exposing the heating surface to the air stream. Rounded surfaces minimize air resistance and even heating is allowed across all surfaces, reducing stress on the heat exchanger.

The many other advanced features include an inshot burner assembly that’s simple to clean and easily within reach, plus safety valves and switches and efficient direct-spark ignition. A self-diagnostic board with LED readout simplifies troubleshooting.

Easy to install

Each unit is tested with complete cycles of start-up and shutdown before being shipped fully assembled with factory-wired controls. Gas and electrical operation verification leads to a quick and easy start-up on the job site. The low cabinet profile of the LF24 and TU models allows installation even in tight spaces and helps where appearance is a concern. The simple-to-install units feature either mounting brackets or spotnuts and centrally located connections for gas, line voltage and thermostats.

Most Lennox units are stocked at a depot near you and available for quick delivery or pickup.

More flexibility keeps everyone more comfortable

Lennox® heating products are available in three unit designs to meet a wide range of commercial and residential applications. These heating products include unit heaters, duct furnaces and separated combustion unit heaters for those hard-to-heat areas.

Several heating capacities are available, making it easy to keep both small and larger spaces comfortable. These reliable heaters and furnaces are available with your choice of natural gas or propane. Horizontal and vertical wall venting options allow the units to be placed in a number of locations.

• Ideal for hard-to-heat applications where excessive dust, dirt or humidity or negative pressure is a concern

• Durable tubular heat exchanger

• Heating capacities from 40,000–300,000 Btuh

• Up to 82% thermal efficiency

• Compact cabinet design on 45,000 Btuh model

• Hinged door allows easy access to components

• Stainless steel heat exchanger is available for longer product life

• Sidewall venting eliminates roof penetrations

• Self-diagnostic board with LED display improves troubleshooting efficiency and accuracy

Unit Heaters

• Ideal for a wide range of residential and commercial applications



• Compact cabinet design on 30,000–75,000 Btuh models

• Stainless steel heat exchanger (for 100,000 Btuh and greater models) is available for longer product life



Duct Furnaces

• Specially designed for applications requiring duct systems



• Compact, lightweight cabinet with suspension points for easy overhead installation

• Stainless steel heat exchanger is available for longer product life



TUA-100S

LD24-200

Separated Combustion Heater

LF24-115

LF24 Unit Heater performance specifications

LD24 Duct furnace performance specifications

GAS HEATING PERFORMANCE CONNECTIONS FAN DATA PHYSICAL DATA

HEATINGCAPACITY

INPUTBTUH [KW]

OUTPUTNATURAL

BTUH [KW]

OUTPUTLPG/

PROPANEBTUH [KW]

STEADY STATEEFFICIENCY

FLUE SIZE

ROUNDINCHES

[MM]

GAS PIPING SIZE

INCHES

NO. OF

FANS

DIA. INCHES

[MM]NO. OFBLADES

NO. OFMOTORS

MOTOROUTPUTHP [W]

MOTORFULL LOADAMPS

[TOTAL]

AIR VOL.CFM [L/S]

DIMENSIONSH X W X L INCHES

SHIPWT. LBS.Model* NATURAL

LPG/PROPANE

LF24-100SLF24-100A

100,000 [29.3]

80,500 [23.6]

82,000 [24.0] 80.5% 82.0% 41

[102] 1/2 1 16 [406] 4 1 1/8

[93] 2.1 1900 [895] 32-3/16 x 20-3/16 x 39-3/16 140

LF24-115SLF24-115A

115,000 [33.7]

92,000 [27.0]

92,000 [27.0] 80.0% 80.0% 41

[102] 1/2 1 16 [406] 4 1 1/8

[93] 2.1 1900 [895] 32-3/16 x 20-3/16 x 39-3/16 140

LF24-145SLF24-145A

145,000 [42.5]

116,000 [34.0]

116,000 [34.0] 80.0% 80.0% 41

[102] 1/2 1 16 [406] 4 1 1/8

[93] 2.1 1900 [895] 32-3/16 x 20-3/16 x 39-3/16 150

LF24-175SLF24-175A

172,500 [50.6]

138,000 [40.4]

138,000 [40.4] 80.0% 80.0% 52

[127] 1/2 1 16 [406] 4 1 1/8

[93] 2.1 2200 [1035] 32-3/16 x 23-1/8 x 40 165

LF24-200SLF24-200A

195,000 [57.1]

156,000 [45.6]

156,000 [45.7] 80.0% 80.0% 52

[127] 1/2 1 16 [406] 4 1 1/8

[93] 2.1 2200 [1035] 32-3/16 x 23-1/8 x 40 165

LF24-230SLF24-230A

230,000 [67.5]

184,000 [53.9]

184,000 [53.9] 80.0% 80.0% 52

[127] 3/4 2 16 [406] 4 2 1/8

[93]2.1

[4.2]4400

[2075] 32-3/16 x 41-1/8 x 40 270

LF24-250SLF24-250A

250,000 [73.3]

201,250 [59.0]

205,000 [60.1] 80.5% 82.0% 52

[127] 3/4 2 16 [406] 4 2 1/8

[93]2.1

[4.2]4400

[2075] 32-3/16 x 41-1/8 x 40 285

LF24-300SLF24-300A

300,000 [87.9]

241,500 [70.8]

246,000 [72.1] 80.5% 82.0% 52

[127] 3/4 2 16 [406] 4 2 1/8

[93]2.1

[4.2]4400

[2075] 32-3/16 x 41-1/8 x 40 305

LF24-345SLF24-345A

345,000 [101.1]

276,000 [80.9]

281,200 [82.4] 80.0% 81.5% 63

[152] 3/4 2 16 [406] 4 2 1/8

[93]2.1

[4.2]4400

[2075] 32-3/16 x 41-1/8 x 41-1/8 310

LF24-400SLF24-400A

390,000 [114.3]

312,000 [91.4]

312,000 [91.4] 80.0% 80.0% 63

[152] 3/4 2 16 [406] 5 2 1/8

[93]2.1

[4.2]4400

[2075] 32-3/16 x 41-1/8 x 41-1/8 310

*"S" denotes stainless steel heat exchanger. "A" denotes aluminized steel heat exchanger. All models are 115 volts, 60 hertz, 1 phase.12-1/8 x 4 in. (54 x 102 mm) diameter adaptor is furnished with unit for flue connection. 22-1/4 x 2-3/4 in. (57 x 70 mm) rectangular to 5 in. (127 mm) round adaptor is furnished with unit for flue connection. 32-1/4 x 2-3/4 in. (57 x 70 mm) rectangular to 6 in. (152 mm) round adaptor is furnished with unit for flue connection.


HEATINGCAPACITY

INPUTBTUH [KW]

HEATINGOUTPUTBTUH [KW]

STEADYSTATE

EFFICIENCY

TEMP.RISE ºF [ºC]

VERT. FLUE SIZE

ROUNDINCHES

[MM]

HORIZ. FLUE SIZE

ROUNDINCHES

[MM]

GAS PIPING SIZE

INCHES

NO. OF

FANS

DIAMETER INCHES

[MM]NO. OFBLADES

MOTOROUTPUTHP [W]

MOTORFULL LOADAMPS

MOTOR RPMS

AIR VOL.CFM [L/S]


SHIPWT. LBS.Model*

LF24-30A 30,000 [8.8]

24,300 [7.1] 81.0%

42 [5.6]

31 [76]

43 [102] 1/2 1

10[254]

4 1/20 [37] 1.7 1650 535

[250] 13 x 25 x 24 60

LF24-45A 45,000 [13.2]

36,500 [10.7] 81.0%

45 [7.2]

31 [76]

43 [102] 1/2 1

10[254]

4 1/20 [37] 1.7 1650 750

[355] 13 x 25 x 24 63

LF24-60A 60,000 [17.6]

48,000 [14.1] 80.0%

55 [12.8]

42 [102]

54 [127] 1/2 1

14[356]

3 1/8 [93] 4.1 1050 830

[390] 18 x 25 x 25 87

LF24-75A 75,000 [22.0]

60,000 [17.6] 80.0%

60 [15.6]

42 [102]

54 [127] 1/2 1

14[356]

3 1/8 [93] 4.1 1050 950

[450] 18 x 25 x 25 91

*"A" denotes aluminized steel heat exchanger. All models are 115 volts, 60 hertz, 1 phase.12-1/8 x 3 in. (54 x 76 mm) diameter adaptor is furnished with unit for flue connection. 22 x 4 in. (51 x 102 mm) diameter adaptor is furnished with unit for flue connection. 33 x 4 in. (76 x 102 mm) vent adaptor required (not furnished) for horizontal venting in residential applications. 44 x 5 in. (102 x 127 mm) vent adaptor required (not furnished) for horizontal venting in residential applications.


HEATINGCAPACITY

INPUTBTUH [KW]

HEATINGOUTPUTBTUH [KW]

STEADYSTATE

EFFICIENCY

TEMP.RISE ºF [ºC]

FLUE SIZEROUNDINCHES

[MM]

GAS PIPING SIZE

INCHES

COND. DRAIN SIZE

INCHES[MM]

AIR VOL. THROUGHOUT

CFM [L/S]


SHIPWT. LBS.Model*

LD24-75SLD24-75A

75,000 [22.0]

60,000 [17.6] 80.0% 21-71

[-6.1-21.7]41

[102] 1/2 1/4 [6]

780-2700 [370-1275] 28.3125 x 19.5 x 34.6875 95

LD24-100SLD24-100A

100,000 [29.3]

80,000 [23.4] 80.0% 20-85

[-6.7-29.4]41

[102] 1/2 1/4 [6]

870-3700 [410-1745] 32.1875 x 20.125 x 40 130

LD24-125SLD24-125A

125,000 [36.6]

100,000 [29.3] 80.0% 20-91

[-6.7-32.8]41

[102] 1/2 1/4 [6]

1020-4700 [480-2220] 32.1875 x 20.125 x 40 135

LD24-150SLD24-150A

150,000 [44.0]

120,000 [35.1] 80.0% 20-84

[-6.7-28.9]41

[102] 1/2 1/4 [6]

1320-5600 [625-2645] 32.1875 x 23.125 x 40 150

LD24-200SLD24-200A

200,000 [58.6]

160,000 [46.9] 80.0% 35-100

[1.7-37.8]52

[127] 3/4 1/4 [6]

1480-4230 [700-1995] 32.1875 x 41.125 x 40 245

LD24-250SLD24-250A

250,000 [73.3]

200,000 (58.6] 80.0% 35-100

[1.7-37.8]52

[127] 3/4 1/4 [6]

1850-5290 [875-2495] 32.1875 x 41.125 x 40 260

LD24-300SLD24-300A

300,000 [87.9]

240,000 [70.3] 80.0% 36-100

[2.2-37.8]52

[127] 3/4 1/4 [6]

2220-6190 [1050-2925] 32.1875 x 41.125 x 40 275

*"S" denotes stainless steel heat exchanger. "A" denotes aluminized steel heat exchanger. All models are 115 volts, 60 hertz, 1 phase.12-1/4 x 4 in. (57 x 102 mm) round flue adaptor is furnished with unit for flue connection. 22-1/4 x 2-3/4 in. (57 x 70 mm) rectangular to 5 in. (127 mm) round adaptor is furnished with unit for flue connection.Note: Due to Lennox’ ongoing commitment to quality, all specifications, ratings and dimensions are subject to change.

True performance, reliability and durability

Tubular Heat Exchanger: Increases efficiency and durability.

Combustion Air Inducer Proving Switch: Prevents unit operation if combustion air flue outlet is blocked.

24V Combination Gas Control Valve with 100% Safety Shutoff: Increases control and protects units.

Integrated Control Board with Direct-Spark Ignition: Improves unit operation and efficiency.

Limit Control: Provides protection from overheat conditions.

Heavy-Gauge Steel Cabinet: Resists corrosion and provides structural stability.

Flame Rollout Sensor (not shown): Improves safety.

Easy to install and maintain

Aluminized Steel Inshot Burners: Low maintenance and easy to clean.

Integrated Control Board with Diagnostics: Aids in troubleshooting.

T-Class™ Unit Heater performance specifications

Hinged Door: Provides easy access to components.

Burner View Port: For easy flame viewing.

External Gas, Line Voltage and Thermostat Connections: Speed installation.

Mounting Spotnuts: Allow for threaded rod installation (100,000 through 300,000 Btuh models).

Application solutions

Separated Combustion Air Inlet: Provides fresh outdoor air for proper combustion.

GAS HEATING PERFORMANCE CONNECTIONS FAN DATA** PHYSICAL DATA

HEATINGCAPACITY

INPUTBTUH [KW]

OUTPUTNATURAL

BTUH [KW]

OUTPUTLPG/

PROPANEBTUH [KW]

THERMAL EFFICIENCY

TEMP. RISE ºF [ºC]

FLUE SIZE

ROUNDINCHES

[MM]

COMBUSTION AIR SIZE ROUND INCHES

[MM]

GAS PIPING SIZE

INCHES [MM]

NO. OF

FANS

DIA. INCHES

[MM]NO. OFBLADES

MOTOROUTPUTHP [W]

MOTORFULL LOADAMPS

[TOTAL]MOTOR RPMS

AIR VOL.CFM [L/S]

DIM.H X W X L INCHES

SHIPWT. LBS.Model* NATURAL

LPG/PROPANE

TUA045S 40,000 [13.2]

32,000 [10.6]

32,000 [10.6] 80.0% 80.0% 45

[25]3

[76]3

[76]1/2

[12.7] 1 10 [254] 5 1/20

[37] 1.7 1650 750 [355] 13 x 26 x 24 84

TUA100S 100,000 [29.3]

81,000 [23.7]

82,700 [24.2] 81.0% 82.0% 31

[17]5

[127]4

[102]1/2

[12.7] 1 16 [406] 4 1/8

[93] 2.7 1075 2435 [1150] 21 x 36.5 x 39.625 188

TUA125S 125,000 [36.6]

101,500 [29.7]

101,500 [29.7] 81.0% 81.0% 39

[21]5

[127]4

[102]1/2

[12.7] 1 16 [406] 4 1/8

[93] 2.7 1075 2435 [1150] 21 x 36.5 x 39.625 204

TUA150S 150,000 [43.9]

120,000 [35.1]

121,500 [35.6] 80.0% 81.0% 38

[21]5

[127]4

[102]1/2

[12.7] 1 18 [457] 4 1/8

[93] 2.7 1075 2955 [1395] 27 x 36.5 x 39.625 261

TUA250S 240,000 [70.3]

194,400 [56.9]

196,800 [57.6] 81.0% 82.0% 35

[19]5

[127]4

[102]3/4

[19.0] 2 16 [406] 4 1/8

[93]2.7

[5.4] 1075 5215 [2460] 39 x 36.5 x 39.625 307

TUA300S 300,000 [87.8]

240,000 [70.3]

243,000 [71.2] 80.0% 81.0% 43

[24]6

[152]4

[102]3/4

[19.0] 2 16 [406] 4 1/8

[93]2.7

[5.4] 1075 5215 [2460] 39 x 36.5 x 39.625 323

*"S" denotes a separated combustion unit heater. All models are 115 volts, 60 hertz, 1 phase.**Fan motor type: Model TUA045S−SP. Models TUA100S, 125S, 150S, 250S & 300S−PSC.Stainless steel heat exchangers are available for heat sizes of 100,000 Btuh or greater models. LPG is not a factory option for stainless steel heat exchangers, but can be field-installed. Note: Due to Lennox’ ongoing commitment to quality, all specifications, ratings and dimensions are subject to change.

TUA-100S

9 3

8 7 5

2

4

1010

12

11

11

6

1

1

2

3

4

5

6

7

4

8

9

10

11

12

Solutions for customized comfortDon’t just choose a Lennox® product—choose a Lennox Commercial Comfort System.

These complete packages of HVAC solutions provide tools to create a healthy and comfortable environment.

Split Systems

• Elite® Series Large Split Systems

• S-Class® Air Conditioners/Heat Pumps

• T-Class™ Air Conditioners/Heat Pumps

• Air Handlers

• Indoor Coils

Solar Ready

• SunSource® Commercial Energy System

Heating

• Unit Heaters

• Duct Furnaces

• Furnaces

Indoor Air Quality

• Dedicated Outdoor Air System

• Humiditrol® Dehumidification System

• Demand Control Ventilation

• Air Filters

• UVC Lamps

Packaged Units

• Energence® Rooftop Units

• Strategos® Rooftop Units

• Landmark® Rooftop Units

• Raider® Rooftop Units

VRF

• Outdoor Units

• Indoor Units

• Controls

Mini-Split Systems

• Wall-Mounted Non-Ducted

• Ceiling Cassette Non-Ducted

• Medium-Static Ducted

• Ceiling/Floor Non-Ducted

Commercial Controls

• Systems Integration Solutions

• Commercial Thermostats

• L Connection® Network

Visit us at www.lennox.com, or contact us at 1-877-726-0024.

© 2018 Lennox Industries Inc. For a complete list of the registered and common law trademarks owned by Lennox Industries Inc., please visit www.lennox.com. 39M37 01/18 PC83727

Litho U.S.A.

unit heaters/ duct furnaces - … · lf24 unit heater performance specifications ld24 duct furnace...

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